Improvements of magnetic binding forces between permanent magnet rack and back yoke in large-scale motors

2016 ◽  
Author(s):  
Oh Gyu Kwon ◽  
Hong Soon Choi
Keyword(s):  
Permanent Magnet ◽  
Large Scale ◽  
Binding Forces

Arrays of Rotating Permanent Magnet Dipoles for Stirring and Pumping of Liquid Metals

2015 ◽  
Vol 15 (1) ◽  
pp. 35-39 ◽  
Author(s):  
Andris Bojarevičs ◽  
Toms Beinerts ◽  
Mārtiņš Sarma ◽  
Yurii Gelfgat
Keyword(s):  
Liquid Metal ◽  
Permanent Magnet ◽  
Large Scale ◽  
Liquid Metals ◽  
Physical Modelling ◽  
Industrial Applications ◽  
Parameter Analysis ◽  
Wide Range ◽  
Metallurgical Furnaces ◽  
Multiple Configurations

AbstractMultiple configurations of synchronously rotating permanent magnet cylinders magnetized across the axes are proposed for liquid metal stirring for homogenization as well as for pumping. Universal analytical model is used for an initial parameter analysis. Then experimental setups were built to perform physical modelling of the industrial applications, e.g. large-scale metallurgical furnaces. Velocity distribution in the liquid metal was measured using different methods: the Ultrasound Doppler anemometry and the potential difference probes. The study shows that the cylindrical permanent magnet setups can achieve up to 10 times higher energy efficiency compared to AC inductors and have potential of wide-range industrial application, e.g. can be used as stirrers for secondary aluminium furnaces with up to 50 cm thick walls.

scholarly journals Diagnosis of Short-Circuit Fault in Large-Scale Permanent-Magnet Wind Power Generator Based on CMAC

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
Chin-Tsung Hsieh ◽  
Her-Terng Yau ◽  
Jen Shiu
Keyword(s):  
Fault Diagnosis ◽  
Permanent Magnet ◽  
Wind Power ◽  
Large Scale ◽  
Short Circuit ◽  
Back Propagation ◽  
Power Generators ◽  
Error Back Propagation ◽  
Wind Power Generator ◽  
Wind Power Generators

This study proposes a method based on the cerebellar model arithmetic controller (CMAC) for fault diagnosis of large-scale permanent-magnet wind power generators and compares the results with Error Back Propagation (EBP). The diagnosis is based on the short-circuit faults in permanent-magnet wind power generators, magnetic field change, and temperature change. Since CMAC is characterized by inductive ability, associative ability, quick response, and similar input signals exciting similar memories, it has an excellent effect as an intelligent fault diagnosis implement. The experimental results suggest that faults can be diagnosed effectively after only training CMAC 10 times. In comparison to training 151 times for EBP, CMAC is better than EBP in terms of training speed.

Rapid and large-scale separation of magnetic nanoparticles by low-field permanent magnet with gas assistance

AIChE Journal ◽  
2014 ◽  
Vol 60 (9) ◽  
pp. 3101-3106 ◽  
Author(s):  
Wensong Li ◽  
Liangrong Yang ◽  
Huizhou Liu ◽  
Xiaopei Li ◽  
Zhini Liu ◽  
...  
Keyword(s):  
Magnetic Nanoparticles ◽  
Permanent Magnet ◽  
Large Scale ◽  
Scale Separation ◽  
Low Field

Calculation and Analysis on PM Thermal Characteristics Influence Performance of PMSM Based on FEM

2011 ◽  
Vol 84-85 ◽  
pp. 676-680
Author(s):  
Ji Zhu Liu ◽  
Xiao Hui Yu ◽  
Shao Hua Wang ◽  
Tao Chen ◽  
Rui Zheng Long
Keyword(s):  
Permanent Magnet ◽  
Large Scale ◽  
Permanent Magnets ◽  
Permanent Magnet Synchronous Motor ◽  
Thermal Characteristics ◽  
The Finite Element Method ◽  
Working Temperature ◽  
Knee Point ◽  
Reverse Magnetic Field ◽  
Selection Of

The irreversible demagnetization of Nd-Fe-B permanent magnet (PM) material appears during the use of Nd-Fe-B permanent magnet synchronous motor (PMSM) has been blocking this kind of motor towards the direction of large-scale. Demagnetization of PM is mainly affected by the working temperature and the reverse magnetic field of stator armature, and the accurate calculation for the demagnetization characteristics of PMSM is usually difficult by using the analytical method. In this paper, we derive the calculation formula of the knee point under a working temperature for permanent magnets in PMSM firstly, then calculate and analyze the demagnetization characteristics of PMSM under different working temperatures and loads by using the Finite Element Method (FEM), Thereby more accurately reflect the working characteristics of PM and the overload capability of motor. This paper provides theoretical basis for the selection of PM materials and the calculation of PM thickness in the PMSM design.

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